Battery charger



FIG. 1 is a perspective view of a battery charger showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is an enlarged left side elevational view thereof;

FIG. 5 is an enlarged right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the battery charger and form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 